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Title: In Situ Diffraction from Levitated Solids Under Extreme Conditions-Structure and Thermal Expansion in the Eu 2 O 3 -ZrO 2 System

Abstract

The accurate determination of structure and thermal expansion of refractory materials at temperatures above 1500 degrees C is challenging. Here, for the first time, we demonstrate the ability to reliably refine the structure and thermal expansion coefficient of oxides at temperatures to 2200 degrees C using in situ synchrotron diffraction coupled with aerodynamic levitation. Solid solutions in the Eu2O3-ZrO2 binary system were investigated, including the high-temperature order-disorder transformation in Eu2Zr2O7. The disordered fluorite phase is found to be stable above 1900 degrees C, and a reversible phase transition to the pyrochlore phase is noticed during cooling. Site occupancies in Eu2Zr2O7 show a gradual increase in disorder on both cation and anion sublattices with increasing temperature. The thermal expansion coefficients of all cubic solid solutions are relatively similar, falling in the range 8.6-12.0x10(-6)C(-1). These studies open new vistas for in situ exploration of complex structural changes in high-temperature materials.

Authors:
 [1];  [1];  [2];  [3];  [1];
  1. Peter A. Rock Thermochemistry Laboratory and Neat ORU, University of California, Davis, One Shields Avenue 4415 Chemistry Annex Davis California 95616
  2. Materials Development, Inc., 3090 Daniels Court Arlington Heights Illinois 60004; X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, 9700 S. Cass Avenue Lemont Illinois 60439
  3. X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, 9700 S. Cass Avenue Lemont Illinois 60439
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1376722
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Journal of the American Ceramic Society
Additional Journal Information:
Journal Volume: 98; Journal Issue: 4; Journal ID: ISSN 0002-7820
Publisher:
American Ceramic Society
Country of Publication:
United States
Language:
English

Citation Formats

Maram, Pardha S., Ushakov, Sergey V., Weber, Richard J. K., Benmore, Chris J., Navrotsky, Alexandra, and Raveau, B. In Situ Diffraction from Levitated Solids Under Extreme Conditions-Structure and Thermal Expansion in the Eu 2 O 3 -ZrO 2 System. United States: N. p., 2014. Web. doi:10.1111/jace.13422.
Maram, Pardha S., Ushakov, Sergey V., Weber, Richard J. K., Benmore, Chris J., Navrotsky, Alexandra, & Raveau, B. In Situ Diffraction from Levitated Solids Under Extreme Conditions-Structure and Thermal Expansion in the Eu 2 O 3 -ZrO 2 System. United States. doi:10.1111/jace.13422.
Maram, Pardha S., Ushakov, Sergey V., Weber, Richard J. K., Benmore, Chris J., Navrotsky, Alexandra, and Raveau, B. Wed . "In Situ Diffraction from Levitated Solids Under Extreme Conditions-Structure and Thermal Expansion in the Eu 2 O 3 -ZrO 2 System". United States. doi:10.1111/jace.13422.
@article{osti_1376722,
title = {In Situ Diffraction from Levitated Solids Under Extreme Conditions-Structure and Thermal Expansion in the Eu 2 O 3 -ZrO 2 System},
author = {Maram, Pardha S. and Ushakov, Sergey V. and Weber, Richard J. K. and Benmore, Chris J. and Navrotsky, Alexandra and Raveau, B.},
abstractNote = {The accurate determination of structure and thermal expansion of refractory materials at temperatures above 1500 degrees C is challenging. Here, for the first time, we demonstrate the ability to reliably refine the structure and thermal expansion coefficient of oxides at temperatures to 2200 degrees C using in situ synchrotron diffraction coupled with aerodynamic levitation. Solid solutions in the Eu2O3-ZrO2 binary system were investigated, including the high-temperature order-disorder transformation in Eu2Zr2O7. The disordered fluorite phase is found to be stable above 1900 degrees C, and a reversible phase transition to the pyrochlore phase is noticed during cooling. Site occupancies in Eu2Zr2O7 show a gradual increase in disorder on both cation and anion sublattices with increasing temperature. The thermal expansion coefficients of all cubic solid solutions are relatively similar, falling in the range 8.6-12.0x10(-6)C(-1). These studies open new vistas for in situ exploration of complex structural changes in high-temperature materials.},
doi = {10.1111/jace.13422},
journal = {Journal of the American Ceramic Society},
issn = {0002-7820},
number = 4,
volume = 98,
place = {United States},
year = {2014},
month = {12}
}

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